rename completion computer to contributor

pkg/analysis_server/lib/src/services/completion/arglist_computer.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library services.completion.computer.dart.arglist;
+library services.completion.contributor.dart.arglist;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/local_declaration_visitor.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 
 /**
- * A computer for calculating `completion.getSuggestions` request results
+ * A contributor for calculating `completion.getSuggestions` request results
  * when the cursor position is inside the arguments to a method call.
  */
-class ArgListComputer extends DartCompletionComputer {
+class ArgListContributor extends DartCompletionContributor {
   _ArgListSuggestionBuilder builder;
 
   @override
   bool computeFast(DartCompletionRequest request) {
     builder =
         request.target.containingNode.accept(new _ArgListAstVisitor(request));
     return builder == null;
   }
 
   @override
@@ skipping 162 matching lines @@
       if (id != null) {
         String name = id.name;
         if (name != null && name.length > 0) {
           return name;
         }
       }
     }
     return 'dynamic';
   }
 }